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• REPORT OF ADDITIONAL GECINSATRI?: <br /> ' SOIL AND GROUNDWATER INVESTIGATION <br /> Ridgeway (formerly Burns) Property <br /> (San Joaquin County APN 232-170-05) <br /> 1881 Rustan Road <br /> Tracy, California <br /> 1.0 INTRODUCTION <br /> This report presents results of field activities performed by Geomarrix Consultants, Inc. (Geomatrix), <br /> on behalf of Chevron Environmental Management Company(CEMC), at the Ridgeway(formerly <br /> Bums)Property(San Joaquin County APN 232-170-05), located at 1881 Rustan Road in Tracy, <br /> California(the site;Figure 1). The investigations described in this report occurred during two <br /> separate field efforts;the first was conducted in May 2000 and the second was conducted in October <br /> 2000. The May 2000 investigation included advancing two soil borings to collect soil and grab <br /> ' groundwater samples at off-site locations. The October 2000 investigation included advancing one <br /> soil boring to collect a grab groundwater sample at an on-site location. This work was performed in <br /> '• accordance with Geomatrix's March 22,2000 work plan submitted to San Joaquin County Public <br /> Health Services(SJCPHS). <br /> ' The purpose of this work was to obtain data to assess the off-site lateral extent of petroleum <br /> hydrocarbon-affected soil and to evaluate groundwater quality on site and downgradient of the site. <br /> This report contains a description of previous work conducted at the site,a summary of the objectives <br /> of the May and October 2000 investigations, a description of the sampling activities performed,the <br /> results obtained from the two investigation,and our conclusions regarding site conditions. <br /> 2.0 BACKGROUND <br /> ' Chevron's former Old Valley Pipeline(OVP)was located along the northern boundary of the site <br /> adjacent to the railroad right-of-way. The OVP transported heavy petroleum(crude and fuel oil) <br /> ' from Bakersfield to Richmond, California, from the early 1900s to the 1950s. <br /> ' On May 12, 1999,Earth Systems Consultants(ESC)advanced one soil boring in the northwest <br /> comer of the property where a reported pipeline release occurred in 1935 (boring EB 1 a;Figure 2). <br /> ESC reported no visible indications of petroleum hydrocarbons in soil or groundwater. EBS <br /> collected three soil samples(at depths of 2.5,5,and 12 feet below ground surface [bgs])and a grab <br /> • groundwater sample from the boring. All samples were analyzed for purgeable and extractable <br /> \\SF3\DEPTDATA\DOC_SAFE\6000S\6115.00TDEC2000REPORT\BURNS SOILGW RPTNOV00_I.DOC 1 <br />